Belt Drives

Question 1

What are the 3 groups of belt drives?

Answer 1

1) V-type
2) Flat
3) Toothed

Question 2

V-type belt matches a grooved pulley called a _____.

Answer 2

Sheave

Question 3

What are the 3 basic classifications of “pulleys”?

Answer 3

1) Sheave
2) Sprocket
3) Drum

Question 4

The toothed style belt matches to a toothed pulley called a _____.

Answer 4

Sprocket

Question 5

A flat belt uses a _____ style pulley?

Answer 5

Drum

Question 6

The component being turned by the belt is called what?

Answer 6

Pulley or driven

Question 7

3 advantages to belt drives:

Answer 7

1) Easy to install
2) No lubrication required
3) Act as a clutch

Question 8

What is one major advantage to flat belts?

Answer 8

Flexibility

Question 9

2 major disadvantages to flat belts:

Answer 9

Requires:
1) High tension
2) High friction

Question 10

Flat belt pulleys need to be _____ or have _____ to keep belt from walking off the pulley.

Answer 10

Crowned or flanges

Question 11

What are the 2 V-type belt constructions?

Answer 11

1) Envelope
2) Raw-edge

Question 12

3 characteristics of envelope type V belts:

Answer 12

1) No white lines on edge
2) Most common in abrasive environments
3) Rubber enclosure around belt for protection

Question 13

2 characteristics of raw-edge type V belts:

Answer 13

1) White line on outside edge
2) Meant to be used in controlled environments

Question 14

What letters are designated with classical V belts?

Answer 14

A, B, C, D and E

Question 15

What do the letters in classical V belts tell us about the belt?

Answer 15

The top width

Question 16

What are the top width sizes of A, B, C and D classical V belts?

Answer 16

A- 1/2”
B- 5/8”
C- 7/8”
D- 1 1/4”

Question 17

Which type of belt sits a little higher than the top of the sheave?

Answer 17

Classical V belt

Question 18

Identify the following belt:

                      B 90

Answer 18

B is a 5/8” classical V belt
90 means the belt is 90”

Question 19

What type of belt sits flush with the top of the sheave?

Answer 19

Wedge V belt

Question 20

What are 3 characteristics of wedge belts:

Answer 20

1) More support to the center of belt
2) More contact surface with the sheave
3) Reduced overhung bearing load

Question 21

What does the letter “X” represent in the belts part number?

Answer 21

X means the belt is cogged

Question 22

What is a major advantage of a belt being cogged?

Answer 22

It’s flexibility

Question 23

Identify the following belt:

                   3VX950

Answer 23

3 means 3/8” top width
V means it’s a wedge belt
X means it’s cogged
950 means the belt is 95” outside length

Question 24

Identify the following belt:

                    5V500

Answer 24

5 means 5/8” top width
V means it’s a wedge belt
500 means it’s 50” outside length

Question 25

What type of belt is designed to operate drives less than 1 horsepower?

Answer 25

Fractional HP V belt

Question 26

What belt is used primarily for low rotational speeds?

Answer 26

Fractional HP V belt

Question 27

What number and letter combination identifies a fractional HP V belt on a part number?

Answer 27

2L
3L
4L
5L

Question 28

What does 2L, 3L, 4L and 5L indicate on a part number?

Answer 28

Belt top width in 1/8” increments of a fractional HP V belt

Question 29

What are the belt width sizes for fractional HP V belt 2L, 3L, 4L and 5L?

Answer 29

2L- 1/4”
3L- 3/8”
4L- 1/2”
5L- 5/8”

Question 30

Identify this belt part number:

                    3L400

Answer 30

3 means the belts top width is 3/8”
L means it’s a fractional HP V belt
400 means it’s a 40” outside belt length

Question 31

Which type of belt handles speed changes and impulse loads which virtually eliminates belt rollover

Answer 31

Banded belts

Question 32

What type of belt has ridges running longitudinally along the inside of the belt?

Answer 32

V ribbed belt

Question 33

Name 5 types of V-belts:

Answer 33

1) Classical
2) Wedge
3) Fractional HP
4) Banded
5) V-ribbed